IMac gpu Heatsink reading -192, DVD fan on full blast

Recently had a problem where my DVD fan would turn on full blast. Did SMC update through apple, smc reset, pram reset. everything. Download iStat after none of that worked, and it said my gpu heatsink was at -192 degrees F. Obviously thats not right. What could this be?

Sounds like a faulty sensor or loose sensor cable.
Run the Apple Hardware Test, as per > Using Apple Hardware Test

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    I followed the steps here to reset the SMC, but I still cannot get my iMac to stop runnin the fan at full blast. What now?

    Ensure you are  using the SMC reset for an Intel iMac. Sometimes it take several tries back to back for the SMC reset to work. I've included a link to the correct instructions for an Intel iMac (just in case) , click https://discussions.apple.com/docs/DOC-3603.
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